/********************
  Common
********************/

html, body {
  height: 100%;
  width: 100%;
  padding: 0;
  margin: 0;
  overflow:hidden;
  background: #74ebd5;  /* fallback for old browsers */
  background: -webkit-linear-gradient(to bottom, #ACB6E5, #74ebd5);  /* Chrome 10-25, Safari 5.1-6 */
  background: linear-gradient(to bottom, #ACB6E5, #74ebd5); /* W3C, IE 10+/ Edge, Firefox 16+, Chrome 26+, Opera 12+, Safari 7+ */
}

/********************
  Contents
********************/

canvas#canvas {
  background: #74ebd5;  /* fallback for old browsers */
  background: -webkit-linear-gradient(to bottom, #ACB6E5, #74ebd5);  /* Chrome 10-25, Safari 5.1-6 */
  background: linear-gradient(to bottom, #ACB6E5, #74ebd5); /* W3C, IE 10+/ Edge, Firefox 16+, Chrome 26+, Opera 12+, Safari 7+ */
}